Building girder and column.



PATENTED SEPT. 10, 19137.

G. M. GRAHAM.

BUILDING GIRDER AND GBLUMN.

APYLIUATIDI TILED DEC. 27, 190B.

2 sums-sum 1.

No. 865,488. PATENTED SEPT. 10, 1907. G. M. GRAHAM. BUILDING GIRDER ANDCOLUMN.

APPLICATION FILED DEG. 27,1906,

2 SHEETS-SHEET 2.

r STATES: PATENT OFFICE? GEORGE L-OF. euro- GO, rLLriIoIs, ASSIGNOR, BYDIREGTIYAND-MESNE ASSIGN- jams-fro on. EDWARD KOHLER; OF CHICAGO,ILLIN'O'IS.

surname GIRDEB am) conunm,

Application filed Decemher 27, 19 06; Serial lio- 349.68 2.

To all who'm a may-concern:

Be it known that I, GEORGE M. GRAHAM, a citizen of the United States ofAmerica, and a resident of Chicage, in thecounty'of Cook and State ofIllinois, have invented certain new and useful improvements in BuildingGirders and Columns, of which the following is a specification.

This invention relates to that type of tubular building girders andcolumns having a plain exterior in which bracing meansis arranged in'theinterior of the article to strengthen thesame against lateral strainsand flexure; and the present improvement has for its objectto provide asimple and eflicient structural arrangement and f combination of thebracing members wholly within the interior of the girder or columnwhereby a maximum degree of strength is attained with a minimum amountof material, and with which the exterior of the girder oicolumn from endto endis left of an even and plain iorm adapted for easy and substantialattachment to the fittings by which said girders and columns areconnected to other members of the metal reinforce frame of concretebuilding structures and the like, all as will hereinafter more fullyappear.

In the accompanying drawings: Figures 1, 2 and 3 are detail longitudinalsections, illustrating respectively the primary, intermediate and themore complex forms of the present invention. Figs. 4, 6.and 8, are' endelevations of the constructions shown in Figs. 1, 2

and 3 respectively. Figs. 5, 7 and 9 are transverse body or shell of thegirder or column, usually circular in cross-section and preferablyformed from a section of wrought metal tubing of the required length anddiameter. 3 I 2, are end heads fitting the respective ends of thetubular bore of the body or shell 1, and provided with annular flanges3, which have bearing against the ends of the body or shell 1; Suchheads may be of the plate form shown in Fig. 3, but for many locations,each of said heads will be formed with an offset 4 atone side for thereception of the screwnuts'of the tension member hereinafter described,and with such construction 7 each end of the body or shell 1 will beformed with a;

corresponding offset, as shown more particularly in Figs. l and 2.

5, are one or more tension rods or members extending from end to end ofthe shell 1, and provided at their respective ends with heads or nuts 6,by means of which bearings are had against the outer end faces of theaforesaid end heads; said nirts 6 preferably occupy the before describedoffset 4 of the end heads.

7.. are strut pieces or collars arranged within the-bore of the girderor column, nearthe mid-length of the Patents'mse t. 10, 1907.

same, and preferably arranged so that a diagonal posi- I tion will beimposed on the respective end portionsof the tension rods or members 5.Such strut pieces fit the bore of the girder or column, and are providedwith suitableorifices for the passage of the tension rods or members 5,and may 'be attached thereto by set screws 8, to prevent independentmovement between the parts. s 4

A material part of the present invention consists in the deflection ofsaid tension rods'in a diagonal direction across the longitudinal axisof the. girder or column to near the margin of an intermediate strut 7,as shown; such arrangement affording a maximum bracing effect with aminimum amount of material. I

9. are 2. series of apertures through the end heads 2; and 10 aresimilar apertures in the strut pieces or collars "7, for the convenientintroduction of a filling of concrete into the interior of the girder orcolumn when the same is desired and with a view to afford greaterlateral strength, as well as to provide greater resistance againstlateral flexure when exposed to fire.

11, are transverse orifices formed in the end heads 2, and in theportions of the body or shell 1 adjacent to said heads, such orificesare intended to afford passages I for thebolts by which the ends of thegirder or column are held in place in the fittings which connect agirder or column with adjacent members oithe rein-force.

nietal frame of-a concrete building structure, as fully 5 set forth inmy companion applications for Letters Patent' Serial Numbers 349,683 and349,684 filed of even date herewith.

The scope of the present invention includes the use I of a singletension rod or member 5, or a multiplicity of the same within a girderor column, as well as the positioning of said tension rods or memberswith relation to each other, as the judgment of the constructor maydirect as best subserving the functions of the present invention.

Having thus fully described my said invention what I claim as new' anddesire to secure by Letters Patent- 1. The combination ofa main shell,heads arranged at.

the longitudinal axis thereof and connected to said heads near themargins thereof substantially, as set forth.

2. The combination of a main shell, heads arranged at each end of thesame, one or more tension members arranged within said shell andextending diagonally across the longitudinal axis thereof and connectedto said heads, near the margins thereof and a strut arranged within theshell lntermedlateof its lengthand adapted to maintain said tensionmember or members in the diagonal relation aforesaid, substantially asset forth.

3. The combination of a main shell, apertured heads arranged at each endof the same, and one or more tension members arranged within said shelland extending diago nally across the longitudinal axis thereof andconnected to' said heads, near the margins thereof substantially as setforth.

4. lfhe combination of a main shell, apertured heads arranged at eachend of the same, one or more tension mem bers arranged within said shelland'extending diagonally across the longitudinal axis thereof andconnected to said heads, near the margins thereof and an apertured strutarranged within said shell intermediate its length and adapted tomaintain said tension member or members in the diagonal relationaforesaid, substantially as set forth.

5. The combination of a main 'sheli, offset heads arranged at each endof the same,-and one or more tension members arranged within said shelland connected to said' heads by nuts or heads occupying the'ofitsetportions of the hr fiis aforesaid, substantially as set forth.

6."lhe combination of a main shell, offset heads arranged 'at each endof the same, and one or more tension members arranged diagonally withinsaid 'shell andcon nected to said heads by nuts or heads occupying theoffset portions of the heads aforesaid, substantially as set forth. 7.The combination of a main shell, oltset heads arranged at each end ofthe same, one or more tension members arranged within said shell andconnected to said heads by nuts or heads occupying the offset portionsof the heads aforesaid, and a strut arranged within the shell andadapted to a diagonalv position upon said tension member or member's,substantially as set forth.

Signed at Chicago, Illinois, this 19th day of December, 1906.

GEORGE M. GRAHAM.

Witnesses:

ROBERT BURNS, HENRY Mon.

